Industry experts recommend using a warehouse wall vibrators of the CZ (electromagnetic) Atlanta manufacturing coal feeder 
 Warehouse wall vibrators CZ (electromagnetic), generally used for the hopper of the small capacity of the steel structure or steel chute to guide the feeding tube. The vibrator is mounted on the silo wall outside. Vibration when the silo local produce elastic shock, vibration and further penetrate a certain depth in the material, the activation part of the material flow to reach the broken arch, anti occlusion purpose.